Olivia Newton-John: "A smile is the best facelift"

'A smile is the best facelift': Under the microscope with Olivia Newton-John | UPDATED: 01:31 GMT, 15 May 2012 The singer and actress, 63, on beating breast cancer, exercising every day, why she suffered from depression and how she stays young-at-heart 'I think eating well, and being positive and happy, are the best ways to stay young,' said Olivia Newton-John EVER DIETED My weight has been pretty constant since my 20s, and never fluctuates by more than a few pounds.